The lecture quality itself was disappointing, including noises heard intermittently during the lecture and parts where it didn't proceed smoothly and cut off, and the lecture content was also disappointing. They taught minor things like Lombok, JPA method naming conventions, and JWT, but it was regrettable that for the lecture's main topic, the important STOMP, they only provided simple implementation code without any explanation. It was particularly puzzling why JWT was explained in relatively detail across 4 sections, but for WebSockets, they finished the explanation with a single simple image, and for STOMP, they didn't explain it at all. Furthermore, I also wondered why about 6 minutes of content where a bug was not found was uploaded as a lecture, and the lack of any mention in the lecture where the bug occurred made me think that the post-processing was not properly done. The incorrectly written code in the 7th lecture was corrected in the 28th lecture, but even if the 7th lecture isn't revised, I think it would be better to specify the cause of the bug. Besides the mentioned points, there were many other regrettable aspects, making me quite dissatisfied, and I would not be able to recommend this lecture to others.